Knitting has had a resurgence over the past fiften-plus years, kicked off by a wonderful designer (Kaffe Fasset) whose use of colour was revolutionary; his designs are stunning, sometimes dreadfully complicated (it took me three years, on and off, to finish one sweater) and sometimes simple; he uses very plain shapes and stitches but glorious mixtures of colour. He started life as a painter, and it shows. He also produces needlepoint and patchwork. There was also a brief flurry of knitting amongst Holllywood stars, but I gather that's died down now. But if you have a search for Kaffe Fasset, and Sally Melville, and Brandon Mably, they have designs that'll knock your socks off.
Crochet is, I agree with you, disappearing. There was a resurgence in the late 1960s and early 70s (I collect old patterns, and you'll find lots of crochet Chanel-type suits, as well as shawls which accompanied the original Laura Ashley styles - old-fashioned Victorian pretty) but it's difficult to find anything nowadays. Pity, because only today I was going through the family treasures and came across heaps of beautiful crocheted shawls that look difficult but were, I'm told, easy and quick to do.
Home dressmaking: there's no longer any price advantage in making one's own clothes, so it's thriving (i) in places where purchased clothes are dull - I used to spend lots of time in New Zealand, which has a very small population and used to have very strong import restrictions, so if you wanted something unusual you had to make it yourself, and I was very surprised to find two fabric shops right in the centre of the capital city, and (ii) the other area where it thrives is in the making of fancy dress and costumes - so that most of the major pattern manufacturers now carry big lines in reproduction Civil War costumes (and other periods, but I guess there's a Scarlett O'Hara living inside most women trying to get out) and reproductions of styles from Lord of the Rings and similar fantasy films.
Are they dying out? for utilitarian purposes, I think the answer's Yes; but as someone who finds it almost impossible to sit with idle hands, I love knitting sweaters with millions of colours and at a guess I'd say that there are three or four new and interesting knitting books appearing on Amazon every month or so.
Having said all that, I ought to add that every year there's a three-day large craft show near me, and the last time I pitched up it was absolutely heaving with middle-aged ladies - few of them having been short-changed in the ass department - fighting one another over access to needlepoint pictures of pretty (oh, so pretty) dogs, cats, landscapes, mottoes, etc., etc. I suppose that they live in the woodwork somewhere and emerge once a year to stock up on kitsch. But I've found a few interesting knitting books to quote for you ...